CA1242306A - Recuperation de l'acide dans la preparation de dioxyde de chlore - Google Patents

Recuperation de l'acide dans la preparation de dioxyde de chlore

Info

Publication number: CA1242306A
Authority: CA; Canada
Prior art keywords: stream; sulphuric acid; effluent; acid; sodium sulphate
Prior art date: 1984-07-30
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired

Application number

CA000460005A

Other languages

English (en)

Inventor

Zbigniew Twardowski

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Tenneco Canada Inc

Superior Plus Inc

Original Assignee

Tenneco Canada Inc

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1984-07-30

Filing date

1984-07-30

Publication date

1988-09-27

1984-07-30 Application filed by Tenneco Canada Inc filed Critical Tenneco Canada Inc

1984-07-30 Priority to CA000460005A priority Critical patent/CA1242306A/fr

1984-08-01 Priority to US06/636,506 priority patent/US4678655A/en

1988-09-27 Application granted granted Critical

1988-09-27 Publication of CA1242306A publication Critical patent/CA1242306A/fr

Status Expired legal-status Critical Current

Links

239000002253 acid Substances 0.000 title claims abstract description 101
OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 title claims abstract description 84
239000004155 Chlorine dioxide Substances 0.000 title claims abstract description 42
235000019398 chlorine dioxide Nutrition 0.000 title claims abstract description 42
238000011084 recovery Methods 0.000 title description 12
PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 131
QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 111
235000011149 sulphuric acid Nutrition 0.000 claims abstract description 111
239000001117 sulphuric acid Substances 0.000 claims abstract description 85
238000000034 method Methods 0.000 claims abstract description 82
229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 71
235000011152 sodium sulphate Nutrition 0.000 claims abstract description 71
230000008569 process Effects 0.000 claims abstract description 68
239000003011 anion exchange membrane Substances 0.000 claims abstract description 34
239000000460 chlorine Substances 0.000 claims abstract description 27
ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 24
229910052801 chlorine Inorganic materials 0.000 claims abstract description 23
239000012736 aqueous medium Substances 0.000 claims abstract description 20
239000002699 waste material Substances 0.000 claims abstract description 19
239000012528 membrane Substances 0.000 claims description 43
RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 28
229910001868 water Inorganic materials 0.000 claims description 25
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
230000009467 reduction Effects 0.000 claims description 15
239000004291 sulphur dioxide Substances 0.000 claims description 14
235000010269 sulphur dioxide Nutrition 0.000 claims description 14
-1 dichromate ions Chemical class 0.000 claims description 13
239000012429 reaction media Substances 0.000 claims description 13
230000002378 acidificating effect Effects 0.000 claims description 12
239000007832 Na2SO4 Substances 0.000 claims description 11
239000000376 reactant Substances 0.000 claims description 11
150000002500 ions Chemical class 0.000 claims description 9
238000001556 precipitation Methods 0.000 claims description 9
XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 claims description 8
238000004519 manufacturing process Methods 0.000 claims description 8
239000012431 aqueous reaction media Substances 0.000 claims description 7
VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 5
230000005012 migration Effects 0.000 claims description 5
238000013508 migration Methods 0.000 claims description 5
230000001376 precipitating effect Effects 0.000 claims description 5
238000004064 recycling Methods 0.000 claims description 5
230000000694 effects Effects 0.000 claims description 4
ZQOMKIOQTCAGCM-UHFFFAOYSA-L [Na+].[Na+].OS(O)(=O)=O.[O-]S([O-])(=O)=O Chemical compound [Na+].[Na+].OS(O)(=O)=O.[O-]S([O-])(=O)=O ZQOMKIOQTCAGCM-UHFFFAOYSA-L 0.000 claims description 3
238000009621 Solvay process Methods 0.000 claims description 2
238000006243 chemical reaction Methods 0.000 claims description 2
230000014759 maintenance of location Effects 0.000 claims description 2
ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims 1
239000007787 solid Substances 0.000 claims 1
238000000502 dialysis Methods 0.000 abstract description 7
238000001704 evaporation Methods 0.000 abstract description 7
OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 27
BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 9
QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 7
229910021653 sulphate ion Inorganic materials 0.000 description 7
239000000203 mixture Substances 0.000 description 6
238000000926 separation method Methods 0.000 description 6
239000006227 byproduct Substances 0.000 description 4
239000003638 chemical reducing agent Substances 0.000 description 4
239000007789 gas Substances 0.000 description 4
239000007788 liquid Substances 0.000 description 4
XLYOFNOQVPJJNP-UHFFFAOYSA-O oxonium Chemical compound [OH3+] XLYOFNOQVPJJNP-UHFFFAOYSA-O 0.000 description 4
239000000047 product Substances 0.000 description 4
150000003839 salts Chemical class 0.000 description 4
239000000243 solution Substances 0.000 description 4
HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
238000010960 commercial process Methods 0.000 description 3
238000010586 diagram Methods 0.000 description 3
230000008020 evaporation Effects 0.000 description 3
238000002474 experimental method Methods 0.000 description 3
238000007670 refining Methods 0.000 description 3
229910001415 sodium ion Inorganic materials 0.000 description 3
FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 2
FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
150000001412 amines Chemical class 0.000 description 2
125000000129 anionic group Chemical group 0.000 description 2
239000011260 aqueous acid Substances 0.000 description 2
230000015572 biosynthetic process Effects 0.000 description 2
238000009792 diffusion process Methods 0.000 description 2
230000004907 flux Effects 0.000 description 2
239000007791 liquid phase Substances 0.000 description 2
239000011159 matrix material Substances 0.000 description 2
239000002609 medium Substances 0.000 description 2
229910052751 metal Inorganic materials 0.000 description 2
239000002184 metal Substances 0.000 description 2
230000004048 modification Effects 0.000 description 2
238000012986 modification Methods 0.000 description 2
229920000573 polyethylene Polymers 0.000 description 2
GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
239000000126 substance Substances 0.000 description 2
239000010409 thin film Substances 0.000 description 2
JHWIEAWILPSRMU-UHFFFAOYSA-N 2-methyl-3-pyrimidin-4-ylpropanoic acid Chemical compound OC(=O)C(C)CC1=CC=NC=N1 JHWIEAWILPSRMU-UHFFFAOYSA-N 0.000 description 1
DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
239000004698 Polyethylene Substances 0.000 description 1
239000004743 Polypropylene Substances 0.000 description 1
239000004793 Polystyrene Substances 0.000 description 1
229920001131 Pulp (paper) Polymers 0.000 description 1
229910000831 Steel Inorganic materials 0.000 description 1
NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
239000005864 Sulphur Substances 0.000 description 1
RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
238000010306 acid treatment Methods 0.000 description 1
150000007513 acids Chemical class 0.000 description 1
229910052782 aluminium Inorganic materials 0.000 description 1
XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
238000004458 analytical method Methods 0.000 description 1
239000008346 aqueous phase Substances 0.000 description 1
239000007864 aqueous solution Substances 0.000 description 1
230000009286 beneficial effect Effects 0.000 description 1
QAOWNCQODCNURD-UHFFFAOYSA-M bisulphate group Chemical group S([O-])(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 description 1
238000004061 bleaching Methods 0.000 description 1
238000009835 boiling Methods 0.000 description 1
150000001768 cations Chemical class 0.000 description 1
150000001805 chlorine compounds Chemical class 0.000 description 1
229910001902 chlorine oxide Inorganic materials 0.000 description 1
230000003247 decreasing effect Effects 0.000 description 1
230000003413 degradative effect Effects 0.000 description 1
230000001419 dependent effect Effects 0.000 description 1
230000008021 deposition Effects 0.000 description 1
238000009826 distribution Methods 0.000 description 1
238000005530 etching Methods 0.000 description 1
125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
238000011065 in-situ storage Methods 0.000 description 1
238000005342 ion exchange Methods 0.000 description 1
125000003010 ionic group Chemical group 0.000 description 1
230000007246 mechanism Effects 0.000 description 1
150000002739 metals Chemical class 0.000 description 1
230000007935 neutral effect Effects 0.000 description 1
150000002894 organic compounds Chemical class 0.000 description 1
230000001590 oxidative effect Effects 0.000 description 1
XYFCBTPGUUZFHI-UHFFFAOYSA-O phosphonium Chemical compound [PH4+] XYFCBTPGUUZFHI-UHFFFAOYSA-O 0.000 description 1
238000005554 pickling Methods 0.000 description 1
238000007747 plating Methods 0.000 description 1
229920002492 poly(sulfone) Polymers 0.000 description 1
229920001155 polypropylene Polymers 0.000 description 1
229920002223 polystyrene Polymers 0.000 description 1
229920001343 polytetrafluoroethylene Polymers 0.000 description 1
239000004810 polytetrafluoroethylene Substances 0.000 description 1
238000012545 processing Methods 0.000 description 1
230000000717 retained effect Effects 0.000 description 1
229910052708 sodium Inorganic materials 0.000 description 1
239000011734 sodium Substances 0.000 description 1
239000011780 sodium chloride Substances 0.000 description 1
235000010265 sodium sulphite Nutrition 0.000 description 1
125000006850 spacer group Chemical group 0.000 description 1
229910001220 stainless steel Inorganic materials 0.000 description 1
239000010935 stainless steel Substances 0.000 description 1
239000010959 steel Substances 0.000 description 1
RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium Chemical compound [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 description 1
238000004381 surface treatment Methods 0.000 description 1
238000003786 synthesis reaction Methods 0.000 description 1
239000003784 tall oil Substances 0.000 description 1
239000010936 titanium Substances 0.000 description 1
229910052719 titanium Inorganic materials 0.000 description 1
238000004448 titration Methods 0.000 description 1

Classifications

- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B11/00—Oxides or oxyacids of halogens; Salts thereof
- C01B11/02—Oxides of chlorine
- C01B11/022—Chlorine dioxide (ClO2)
- C01B11/023—Preparation from chlorites or chlorates
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/90—Separation; Purification
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S210/00—Liquid purification or separation
- Y10S210/902—Materials removed
- Y10S210/911—Cumulative poison
- Y10S210/912—Heavy metal
- Y10S210/913—Chromium

Landscapes

Chemical & Material Sciences (AREA)
Organic Chemistry (AREA)
Inorganic Chemistry (AREA)
Life Sciences & Earth Sciences (AREA)
General Life Sciences & Earth Sciences (AREA)
Geology (AREA)
Separation Using Semi-Permeable Membranes (AREA)

CA000460005A 1984-07-30 1984-07-30 Recuperation de l'acide dans la preparation de dioxyde de chlore Expired CA1242306A (fr)

Priority Applications (2)

Application Number	Priority Date	Filing Date	Title
CA000460005A CA1242306A (fr)	1984-07-30	1984-07-30	Recuperation de l'acide dans la preparation de dioxyde de chlore
US06/636,506 US4678655A (en)	1984-07-30	1984-08-01	Acid recovery in clorine dioxide generation

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
CA000460005A CA1242306A (fr)	1984-07-30	1984-07-30	Recuperation de l'acide dans la preparation de dioxyde de chlore
US06/636,506 US4678655A (en)	1984-07-30	1984-08-01	Acid recovery in clorine dioxide generation

Publications (1)

Publication Number	Publication Date
CA1242306A true CA1242306A (fr)	1988-09-27

Family

ID=25670455

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA000460005A Expired CA1242306A (fr)	1984-07-30	1984-07-30	Recuperation de l'acide dans la preparation de dioxyde de chlore

Country Status (2)

Country	Link
US (1)	US4678655A (fr)
CA (1)	CA1242306A (fr)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
AT398986B (de) *	1989-02-06	1995-02-27	Prior Eng Ag	Verfahren zum aufarbeiten von sauren, fe-haltigen lösungen, insbesondere abfallbeizlösungen
US5198080A (en) *	1990-06-08	1993-03-30	Tenneco Canada Inc.	Electrochemical processing of aqueous solutions
US5122240A (en) *	1990-06-08	1992-06-16	Tenneco Canada Inc.	Electrochemical processing of aqueous solutions
CA2116427C (fr) *	1991-09-12	1998-09-29	Rolf C.A. Brannland	Regulation de l'acidite dans la fabrication du dioxyde de chlore
WO1993004979A1 (fr) *	1991-09-12	1993-03-18	Eka Nobel Ab	Regulation de l'acidite dans la fabrication de dioxyde de chlore
US5300191A (en) *	1992-07-30	1994-04-05	Kamyr, Inc.	Chlorine dioxide generation for a zero discharge pulp mill
US5498790A (en) *	1993-06-09	1996-03-12	Novus International, Inc.	Regeneration of sulfuric acid from sulfate by-products of 2-hydroxy-4-(methylthio)butyric acid manufacture
US5491259A (en) *	1994-09-13	1996-02-13	The Dow Chemical Company	Process to produce aminocarboxylic acids containing low residual salt
US5792441A (en) *	1996-10-11	1998-08-11	Pulp And Paper Research Institute Of Canada	Fixed-resin bed technologies for the treatment of the chlorine dioxide generator effluent and feeds stream
US6322768B1 (en)	1998-09-29	2001-11-27	International Paper Company	Recovery of chlorine dioxide from gas streams
KR100419633B1 (ko) *	1999-12-23	2004-02-25	주식회사 포스코	산세액 및 아연-철 합금전기도금용액 제조용염화제일철원액으로의 염산폐액의 재사용방법
US7625533B2 (en) *	2004-11-10	2009-12-01	The United States Of America As Represented By The Secretary Of The Army	Portable chemical sterilizer
US20060108270A1 (en) *	2004-11-19	2006-05-25	Ebara Corporation	Sewage treatment apparatus and method thereof
FI20080298L (fi) *	2007-06-15	2009-10-22	Andritz Oy	Menetelmä nestevirtojen käsittelemiseksi ja käyttämiseksi sellutehtaalla
CN103058441B (zh) *	2013-01-25	2014-01-29	清华大学	一种处理高含盐量酸性废水的方法及设备
CN105600964A (zh) *	2015-12-16	2016-05-25	东江环保股份有限公司	浓硫酸废液的处理方法
CN105565527A (zh) *	2015-12-16	2016-05-11	东江环保股份有限公司	浓硫酸废液的深度处理方法
BR112019016860B1 (pt)	2017-02-27	2024-02-27	Ecolab Usa Inc	Método de tratamento de água de processo em uma torre de resfriamento
MX2019011331A (es)	2017-03-24	2019-12-05	Ecolab Usa Inc	Sistema de generacion in situ de dioxido de cloro de bajo riesgo.
UY37638A (es)	2017-08-17	2019-02-28	Ecolab Usa Inc	Sistema de generación in situ de dióxido de cloro de bajo riesgo
US11970393B2 (en)	2018-07-05	2024-04-30	Ecolab Usa Inc.	Decomposition mediation in chlorine dioxide generation systems through sound detection and control

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2376935A (en) *	1942-12-22	1945-05-29	Duba Ab	Chlorine dioxide manufacture
US2765215A (en) *	1950-10-12	1956-10-02	Columbia Southern Chem Corp	Method of making chlorine dioxide
US3132095A (en) *	1960-11-16	1964-05-05	Wolfen Filmfab Veb	Process for the separation of an acid from a non-acidic component
US4108770A (en) *	1975-08-20	1978-08-22	Roy Clarence H	Chromium reduction process
CA1079482A (fr) *	1976-05-27	1980-06-17	John Howard	Methode pour la separation de l'acide sulfurique du sulfate de sodium neutre

1984
- 1984-07-30 CA CA000460005A patent/CA1242306A/fr not_active Expired
- 1984-08-01 US US06/636,506 patent/US4678655A/en not_active Expired - Lifetime

Also Published As

Publication number	Publication date
US4678655A (en)	1987-07-07

Legal Events

Date	Code	Title	Description
2005-09-27	MKEX	Expiry

Publication	Publication Date	Title
US4678655A (en)	1987-07-07	Acid recovery in clorine dioxide generation
US12358805B2 (en)	2025-07-15	Processing of lithium containing brines
Mani	1991	Electrodialysis water splitting technology
US3554691A (en)	1971-01-12	Gas purification process
US5792441A (en)	1998-08-11	Fixed-resin bed technologies for the treatment of the chlorine dioxide generator effluent and feeds stream
EP0081092A1 (fr)	1983-06-15	Préparation d'hydroxides de métaux alcalins par dissociation de l'eau et par hydrolyse
US4325934A (en)	1982-04-20	Production of chlorine dioxide with conversion of by-product solid phase sodium acid sulphate to its neutral form
US2871097A (en)	1959-01-27	Production of chlorine dioxide
SE511003C2 (sv)	1999-07-19	Förfarande och apparat för framställning av svavelsyra och alkalimetallhydroxid
US5006211A (en)	1991-04-09	Electrodialylic water splitting process for the treatment of aqueous electrolytes
US20230391641A1 (en)	2023-12-07	Method for removing a contaminant from wastewater from an industrial plant and a system for performing such method
US4552635A (en)	1985-11-12	Electrodialytic methods for removal of sulfur oxides from waste gases
TWI447065B (zh)	2014-08-01	二氧化氯之製造方法
CA1118580A (fr)	1982-02-23	Obtention de dioxyde de chlore a faible residu de chlore
EP0016290B1 (fr)	1982-06-09	Procédé continu d'élimination de l'anhydride sulfureux des gaz de combustion, et hydrogène et acide sulfurique ainsi produits
CA1105877A (fr)	1981-07-28	Procede d'obtention de dioxyde de chlore
JPH0776081B2 (ja)	1995-08-16	二酸化塩素の製造方法
US5466352A (en)	1995-11-14	Method and apparatus for processing waste sulfuric acid
US5510035A (en)	1996-04-23	Method of separating sodium hydroxide from white liquor
JP3280382B2 (ja)	2002-05-13	酸性にされたプロセス流の製造方法
CN1016501B (zh)	1992-05-06	二氧化氯的制备
US4483740A (en)	1984-11-20	Method for recovery of reusable chemicals from C102 generator effluent
CA1149131A (fr)	1983-07-05	Obtention de bioxyde de chlore a haut rendement
EP4316632A1 (fr)	2024-02-07	Procédé pour la production d'hydroxyde de lithium (lioh) directement à partir de chlorure de lithium (licl), sans nécessiter une production intermédiaire de carbonate de lithium ou similaire
JP2947366B2 (ja)	1999-09-13	硫酸の製造方法